Great tits, rough-faced shags and blue-footed boobies - birds' names have long been the source of childish giggling.

But once we become adults, imagining the tufted titmouse as anything other than a sparrow-sized songbird is no longer acceptable.

So it's no surprise that Chris Packham kept a straight face on Wednesday night when he told Winterwatch viewers: "We promised you black cock live on the internet first thing in the morning, and if you were watching this morning, this is what you got."

Packham and Strachan in action

The black cock, as we all know, is another name for the black grouse, found in northern Europe, which is known for its eye-catching breeding season display.